Amylopectin and amylose are synthesized in the amyloplast from ADP-glucose, primarily by the enzymes starch synthase and branching enzyme and debranching enzymes. Some other enzymes such as starch phosphorylase, amylogenin (“starch glycogenin”), disproportionating enyzmes have been implicated in the process. However, definitive evidence for their role in the starch assembly process awaits further research.